What is the current that continues to flow across the opening contacts of a switch known as?

The current that continues to flow across the opening contacts of a switch is known as an arc. When a switch is opened under load, the electrical current can create a plasma or an ionized gas that bridges the gap between the contacts. This phenomenon is referred to as arcing. Arcing can lead to damage of the switch contacts and can also pose safety risks, as it generates heat and can produce a bright flash, which may be hazardous if not properly managed.

Understanding arcing is crucial for operators because it impacts the reliability and safety of electrical systems. Operators must be trained to recognize the conditions that lead to arcing and take appropriate steps to mitigate its effects, such as using switchgear designed to minimize arcing or ensuring proper load management when switching operations.